Cylinder-tripping device for



F. S. ENGLISH. CYLINDER TRIPPING DEVICE roa PRINTING PHESSES.

APPLICATION FILED MAY 9. 19l6.

Patented Dec. 16,1919. 7

4 SHEETS-SHEET. l-

' awumtoz- %1a-uu flfliomwq F. S. ENGLISH. CYLINDER TRIPPING DEVICE FOR PRINTING PRESSES.

APPLICATION FILED MAY 9, I916.

1,324,957. Patented Dec. 16,1919.

4 SHEETS-SHEET 2.

F. s. ENGLISH. V CYLINDER TRIPPING DEVICE FOR'PRI NT ING PRESSES.

APPLICATION FILED MAY 9, 19l6.

1,324,957. Patented Dec. 16,1919.

4 SHEETS-SHEET 3.

F. S. 'ENGLI'SH.

CYLINDER TRIPPING DEVICE ron PRINTING PRESSES.

- APPLICATION FILED HAY 9| IBIS- Patented Dec. 16,1919.

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. awvgmwo FRED S. ENGLISH, OF NEW LONDON, CONNECTICUT.

CYLINDER-TRIPPING DEVICE FOR PRINTING-PRESSES.

Specification of Letters Patent.

Patented. Dec. 16, 1919.

Application filed Ma 9, 1916. Serial No. 96,283.

To all whom it may concern:

Be it known that I, FRED S. ENGLISH, a

citizen of the United States, and a resident of N ew London, in the county of New London and State of Connecticut, have invented certain new and useful Improvements in Cylinder-Tripping Devices for Prlntlng- Presses, of which the following is a specification. p

My invention relates to a device for tripping the impression cylinder of a print ng press; that is, for separating the mpression cylinder and form while the press 1s in operation. As is well known in the art, it 1s necessary to have some device on presses to separate the impression cylinder and form so that if the feeder fails to feed a sheet or if he improperly feeds the sheet he can throw off ortrip the impression cylinder so that the form will not transfer ink to any part of the impression cylinder. Usually this is accomplished by moving the cylinder or impression member away from the form or bed, and generally by moving the cylinder upwardly. In single revolution presses of the flat bed kind an impression is made at each revolution of the impression cylinder. The impression portion of the cylinder comprises about one-fourth 0r one-third of the circumference of the cylinder, the remaining portion being depressed or of a lesser diameter, so as to move clear of the form while the bed is 'making its return stroke. In presses of this character it is only necessary to tri or raise the cylinder when the impression is to be thrown out, and I have shown my invention embodied in a well-known press of this character.

Various tripping devices for single revolution presses have beenheretofore used 'or patented, and inmost of them the mechanism which operates the toggles is moving all the time and some device is necessary to make the treadle device effective at certain periods. In the present device the treadle maybe operated at any time but it effects the operation of the raising and lowering device at the desired times and without special devicesfor determining the moment of action of the operating device. In U. S. patent to George P. Fenner, N0. 1,150,107, there is shown a device in which the tripping parts remain idle except when they are rendered operati e for tripping the cylinder, but that device is manually operated; that is, the power for moving the cylinder is furnished'by the feeder. One of the objects of my invention is to provide power or mechanical means for tripping the cylinder, the power means being under the control of the feeder.

Another object of my invention is to provide a device having the above characteristics which will be simple in construction, application and operation.

Another object of my invention is to take the operating force for the tripping device from the movable bed, although the other features. of my invention are not limited to a construction embodying this last mentioned feature.

In the drawings forming part of this appllcation,

Figure 1 is an end elevation of'a printing press embodying my invention,

Fig. 2 is a side elevation of one end of such a press, in which the principal parts of the press are shown, and in which view thefeeding devices are omitted,

Fig. 3 is a similar view in which I have also shown an automatic device for moving the feed board to correspond with the movement of the cylinder.

Fig. 4 is an enlarged elevation of some of the parts of the cylinder tripping device,

and

Fig. 5 is a plan view of the parts shown in Fig. 4. 7

I have indicated in the drawings some of the principal parts of the press suchas may benecessary to an understanding of the application of the invention.

These consist of the sideframe 1, the reciprocating-bed 2, carrying a form 3, the form rollers 4 which supply the ink to the form, the impression cylinder 5, the delivery or take off reel 6, and the fly fingers 7 which deliver the printed sheets. In addition to these, I have shown the feed board 8 from which the feeder feeds the sheets to the impression cylinder, and the platform 9 on which the feeder stands.

The cylinder 5, as is usual in this kind of press, has a depressed portion 10 of lesser diameter and an impression surface 11 of larger diameter. A sheet held "by the grippers 12 and lying on the tympan or on the material with which the impression surface .is covered, receives the impression from the form and is then taken by the delivery reel 6 and from there it is taken by the fly fingers 7 The bed 2 moves forward with the form against the sheet and tympan, during the printing stroke and the bed makes its return motion while the depressed portion 10 of the cylinder is opposite thebechso that there is no contact between the cylinder and form during the return stroke.

I have shown the oylind shaft 13 journaled in slide blocks 14 which move up and down in a guideway in the side frame, this construction being common to both sides of the press. There is a rod 15 engaging the slide block 14 and there is a compression spring 16 on this rod which lies between the cap 17 fixed to the rod, and a part of the side frame, and it tends to move the cylinder upwardly. The purpose of this spring is well known in the art.

There is a block 18 guided in a slot 19 in the frame and adjustable by means of a screw 20 Oneend of one arm 20 of a toggle lever bears against this block 18, and one end of the other arm, 21, of the toggle lever bears on the slide block 14. When the tog le lever is in the position shown in Fig. 3 the cylinder is held down in impression position against the action of the lifting spring 16. When the toggle oint is broken, the cylinder is raised by the spring 16, so that the tyinpan moves free of the form. There is an arm 22 connected to and operating the toggle lever, and this arm is fulcrumed to a short link 23 which is also fulcrumed to an arm 24. The other end of the m 24 is fastened to the shaft 25 which extends across the press. The parts thus far described are of well known construction and require no. further description, except that it may be said that these parts are duplicated on the opposite side of the press.

There is a rod or link 26 having one end fulcrumed on the stud 27 and thereby connected with the arm 24 and link 23, and the lower end of the link 26 is fulcrumed to the arm 28 of a lever which rocks on a stud 29 fixed to the side frame. he rocking of this lever serves to move the link 26 up or down and this either makes or breaks the toggle joint. The lever 28 has two oppositely eX- tending arms 30, 31, provided with rollers 32, 33, respectively, on their outer ends. These rollers are adapted to be singly engaged bya member which is here shown as a double hook bar 34. The latter has upper and lower guiding surfaces 35 and 36, and it has an upper hook 37 for engaging the roller 32 and a lower hook 38 for engaging the roller 33 but only one hook can engage a roller at any one time.

The bar 34 is fulcrunied to one arm 39 of a lever which rocks on a stud 40 fixed to the side frame. The other arm, 41-, of this lever has a roller 42 which engages a cam plate 43 which is fixed to and which recipro cates with the bed. A spring 44 is attached at one end to the lever arm 39 and at the other end to a pin 45 on the frame and its function is to so move the lever 39, 41, as to cause its roller 42 to follow the cam 43.

The cam member 43 is fixed to the bed by bolts 46 and it has a flange 43 forming a cam surface which serves to move the roller 42 upwardly when the bed is moving in one direction and to allow it to descend under the action of the spring 44 when the bed is moving in the other direction. Through this arrangement the power for tripping the cylinder is derived from the bed, which is a very simple and preferred arrangement.

There is a treadle 47 arranged in the platform 9 in position to be operated by the feeder, and the lower end of this treadle is fulcrumed to an arm 48 rigid on the lever arm 49. The latter arm rocks on a fixed stud 50, and it is limited in its upward movement by a stop pin 51. There isa spring 52 fixed at its upper end and having its lower end connected to, a short arm 53 which is connected with or is part of the lever arm 49. he spring moves the. treadle upwardly and it lifts the lever arm 49, holding them in their higher position except when the pressman depresses the treadle to trip the impression cylinder. The arm 49 has an extension 54 which carries a roller 55 that engages under the hook bar 34 for the purpose of raising the latter. As is common in the art, the treadle may be locked in its lower position by forcing the shoulder 56 under the plate on the platform.

Operation: During the normal operation of the press or when it is operating to print the sheets the cylinder 5 is revolving but it does not rise nor fall, and the bed 2 with the form 3 is reciprocating back and forth. The trip device remains inactive at such times, as is shown in Fig. 3, except that the lever 39. 41 and the hook bar 34 move.

The hook bar 34 is held up by the lever arm and the lever 30, 31, 28 is in such position that the hook bar has no action thereon. The lever 39, 41 is periodically rocked by the can: plate 43 on the bed, and the hook bar m back and forth.

allhen the feeder desires to. trip the 'cylinder he depresses the trcadle. This forces down the'lever arm 49 which supports one end of the hook bar 34 and the latter follows down with the lever arm 49. The upper hook 37 is thus caused to disengage from the roller 32. If at the time the treadle is depressed the hook bar 34 should be in an y position other than its extreme right hand position the portion between thehook 38 and the extreme right hand end of the bar will ride on the roller 33 until such time as the hook bar is moved to the right hand position by the cam 43 and then the hook 38 will drop over the roller 33'.

Upon the return stroke of the hook bar, that is, from right to left looking at the press as in Figs. 2 and 3, the hook bar, acting on the lever arm 31, will swing the lever 28, 30, 31 on its stud and this will cause the arm 28 and the rod 26' to move upwardly. The movement is thereby transmitted tothe lever arms 24 and the lever arms 22 and the latter operate to break the toggle joint. This permits the lifting springs 16, to raise the cylinder sufficiently to prevent contact between it and the form. The feeder merely had to depress the treadle, the power for operating the trip being derived from the cam on the moving bed.

When the treadle is released the spring 52 swings the lever arm 49 upwardly (and with it the treadle), and this lifts the hook bar 34. The hook 38 will thus be disengaged from the roller 33. If the hook bar is moved upwardly when it is in any position other than its right hand position the part between the hook 37 and the right hand end of the bar will simply slide against the roller 32 and when the hook bar reaches its right hand position the hook 37 will engage over this roller. Upon the return motion, to the left, the hook bar will act on the arm 30 and swing the lever 28, 30, 81 so as to move the arm 28 and rod 26 downwardly. This will swing the levers 24,- 22 and close or make the toggle joint and this action will force the impression cylinder down against the resistance of the lifting spring 16 and into impression position. The press will now operate to print the sheets.

The treadle may be depressed at any moment, but the hook bar will be effective to move the lever 22 only during its move ment to the left, but this will sufiice to trip the cylinder before the tympan reaches the form.

It will be observed that while the tripping and untripping operations are manu ally initiated the operations are mechanically performed, and that the power is derived from the bed of the press.

When the press is printing the lever 39, 41, is periodically rocked and the hook bar is periodically reciprocated, but the latter has no eflect upon the lever 28, 30, 31, until the treadle is either depressed or raised.

The relation of the hook bar to the arms 30, 31, is such that it can be operatively connected with either at each revolution of the press and the impression cylinder can be tripped or untripped but the hook bar can only be connected at one time with one of these arms. Nothing is required to insure the operation of the tripping device at a definite time other than the construction of the hook bar and its relation to the arms 30, 31.

In order to keep the feed board in proper relation to the impression cylinder in the different positions of the latter I have shown an arrangement similar to that shown in the patent to G. P. Fenner, No. 1,150,107, but I do not claim this device as myinvention. The feed board 8 is supported by the rail 57 which rocks on a stud 58, the construction being the same at both sides of the press. A pin 59 on the other end of the rail 57 is fulcrumed to the cam bracket 60 which is movable up and down with the slide blocks 14. A shaft 62 rocking in brackets projecting from the member 60 carries the feed guides 61, 63. When the cylinder rises or fallsthe end of the feed board rises and falls correspondingly, so that the feed board is always in proper relation to the cylinder.

Having described my invention, what I claim is:

1. In a printing press the combination ofwith which either of said hooks may separately engage whereby said second lever may be operated backwardly or forwardly, and manual means for controlling the engagement of said hook member with said second lever, said power operated lever being constructed to automatically cease actuating the impression member moving lever after each initiation thereof by said manual means.

2. In a single revolution press the combi' nation of a reciprocating bed, an impression member and means for moving the impression member toward and from the bed, comprising a cam movable with the bed, means operated by said cam for raising and lowering the impression member and constructed to automatically cease moving the impres sion member after each initiation thereof by of April, 1916.

FRED S. ENGLISH. 

